DE2733443A1 - Internal combustion engine exhaust system and silencer - uses tubes with multiple bores to cool exhaust gas - Google Patents

Abstract

A silencer forming part of the exhaust system of an internal combustion engine consists of two concentric tubes (51, 52). These tubes are joined by radial walls (55) which extend longitudinally so that the annular space between the tubes is divided into a number of separate compartments (5). A cooling fluid flows in these compartments (5) in the opposite direction to the flow of gas in the central bore (50). The outer wall of the outer tube (52) has a number of radial fins (56) which also extend longitudinally. These fins help to dissipate the heat which has been transferred to the cooling medium by convection and radiation.

Description

Additional application to patent application P 27 19 634.5 (lei S 773)

Designation of the additional application: "Thermal exhaust gas routing addition 6 "Description In the patent application P 27 19 634.5, which bears the designation "Thermal exhaust gas routing additive 1", azurde the aluminum-made component of a ilohikammerringrohres in exhaust systems of internal combustion engines from the technology integrated into a thermal gas flow, the aspects of which are firstly, each hot gas application of an aluminum wall to the opposite surface of the same Wall to assign a thermal gradient, and secondly, to assign the hot gas inlet into the device in the pre-zone, which means that each zone is in front of the impact of aluminum walls is designated to subject to a heat extraction. The latter was the subject of claims 4 and 5 and with regard to the schematic drawings supporting the description Subject of Figures 4 and 6. This additional application has the task on the one hand relating to the inventive ideas disclosed in the description of P 27 19 634.5 the claim formulation to be more precise and, on the other hand, further constructive ones To add points of view. For this reason, drawings 4 and 6 of P 27 19 634.5 repeated here unchanged as Figures 2 and 3. The novelty content this application is consequently explained in more detail with FIG.

Figures 2 and 3 have the "pre-zone" described above in the Identically designated with 17 rooms, in which the hot gas inlet £ both channels from the holes 18 takes place. These pre-zones 17 are, as shown in both figures, of the pipes 16 leading out of the aluminum parts, traversed by the exhaust gas. There these tubes 16 after they have passed through the aluminum walls, which absorb a great deal of heat an exhaust gas is essential have a lower temperature, takes place from the Prezones 17 a constant release of heat in the heat exchange to these outlet pipes 16. This construction already shown in P 27 19 634.5, the hot gas of the pre-zones as it were in the short-circuit path, bypassing the aluminum components in the heat exchange directly To extract heat in the direction of the device outlet is shown in FIG. 1 of this additional application for the application shown that the pre-zone is not as shown in FIGS 3 are arranged in the rear part of the exhaust system, but in the front part. Of the This does not change the technological content of the specified statement. In In all three cases there is a direct supply of heat from the heat exchange Pre-zone in the direction of the device outlet, skipping the aluminum parts. In Fig Ur 1 is room 4, the pre-zone that supplies the hot gas to the aluminum parts. That The aluminum component included in the construction of Figure 1 is an extruded one Tube with the gas duct groups 14, 12 and 11 (enumerated from the outside to the inside). In its interior, the gas guide space 11 is usually not made of aluminum manufactured pipe 16 crosses, which at the same time the outlet pipe of the exhaust gas in the free Represents atmosphere. From the partial flow groups 14, the exhaust gas runs over the thermal cooling space 10 through the line 11 and the holes 15 in the cone interior 18, which is with its wall 19 in heat exchange to the hot gas zone 4, namely with very large surface. The amount of heat now fed through the pipe 16 to the outlet relieves the exhaust gas ducts, which have completely or partially aluminum walls.

L e r s e i t e

Claims (1)

Claim 1. Thermal exhaust system with the aluminum-made Component of a hollow chamber ring tube that stretch in the silencer or cooling Exhaust systems of internal combustion engines is integrated and by ribs in elongated, in particular, gas supply groups running in a path flow arrangement are subdivided, with the feature that the outer wall of the Ilohlkammermantels in the free atmosphere emits, and a further feature that the amount of exhaust gas that the first gas guide leaves, before entering the next gas routing section with an aluminum wall, a thermal Intermediate zone happens in which she suffers a further loss of heat, thereby characterized in that within the between the engine outlet and the first application exhaust gas inlet zone located by aluminum walls (so-called pre-zone, figure 1 1/2/4, Figure 2: 1/2/17, Figure 3: 1/2/17) heat exchange wall to a downstream of the first pressurized aluminum gas ducts located device outlet pipe (Fig 2: 16, Figure 3: 16) or its feed lines (Figure 1: 18) are provided is.